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(N0 Kodel.) 2 Sheets-Sheet 1.

E. WALLER & B. 0. HINMAN.

MANUFACTURE QP WHITE LEAD,

No. 509,059. 4 Patented Nov. 21, 1893.

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UNITED STATES PATENT OFFICE.

ELWYN WALLER, OF N EW-YORK, AND BERTRAND C. HI NMAN, OF BROOKLYN,

, NEW YORK.

MANUFACTURE O F WH ITE LEAD.

SPECIFICATION forming part of Letters Patent No. 509,059, dated November 21, 1893.

Application filed June 7, 1898. SerialNo-4'76,833. (Nospecimena) To all whom; it may concern: The several parts or elements of the appa- Be it known that we, ELWYN WALLER, reratus are connected by pipes and these pipes siding at New York, in the county of New are provided with cocks, all of which will be York, and BERTRAND O. HINMAN, residing at referred to more particularly hereinafter.

Brooklyn, in the county of Kingsf State of The pipes are designated by small reference New York, citizens of the United States, have letters and the cocks by reference numerals. invented certain new and useful Improve- At starting, a charge of lead-bearing powments in the Manufacture of White Lead by d'er, either native carbonate or de-carbonated Precilpitatiomof which the followingis aspeciore, is placed in the digester A, together with [o fication. a solution of neutral lead acetate, and'water, This invention relates in part to a method if necessary, admitted by pipe at, from the of effecting the precipitation of white lead or main. .The digester and its charge is then lead hydrocarbonate from solutions ofv lead heated either bya furnace or steam coil. The acetate, and in part to certain apparatus embasic solution thus produced in the digester, r 5 ployed in such precipitation. is then drawn off into the tank B through The invention will be fully described herethe filter B, by way of pipes b and c, the cocks inafter, in connection with the accompany- 1 and 2 being opened. While the charge of ing drawings, and its novel features carefully basic lead acetate is being prepared and fildescribed in the claims. tered, a charge of carbonated water is pre- 20 In the accompanying drawings-Figure 1 pared in the precipitating vessel D, under is a somewhat diagrammatic plan showing pressure, as will be described moreminutely the several elements or parts of the apparatus hereinafter. The filtered basic solution is and the pipe connections, Fig. 2 is a vertinow taken by the pump 0 from the tank B tica1,axial section of the precipitating vessel and forced 1nto the charged precipitating 7 25 and its attachments, on a larger scale than tank by way of the pipes d, e, f and g, the Fi 1, Fig. 3 is a horizontal section'of this cocks 3, 4:, 5 and 6 being opened. The pipe vessel taken in the plane indicated by line g leads to the bottom of the precipitating vesx, 00, in Fig. 2. sel D, and is adapted to be connected with Referring to Fig. 1-A represents the dieither the receiving or discharge side of the 3o gester, in which finely ground native lead car-- pump 0; with thelatter by means of the crossbonate, or the decarbonated ore, is digested, pipe f, and the cock 5, therein. After the under the influence of heat, with a solution precipitationhas been efiected in the vessel of neutral lead acetate, for the production of D, the liquid contents of this vessel are witha. basic lead acetate solution. drawn by the pump 0 and forced to the set- 5 B is a filter for filtering the basic solution tling tanks E by way of the pipes g, h, c' and and also, where required, for filtering the wa- 9, the cooks 6, 7, 8 and 9 being opened. After employedin the process. ,The liquidfrom ter the white load has settled in the tanks E, the filter flows into a tank or basin 3". the solution of neutral lead acetate is with O is a pump of any good kind, for circulatdrawn from these tanks and forced into the o 40 ing and forcing the water and solutions from digester A, by way of the pipes k, Z, on a d b,

one point to another as required. the cocks 10, l1 and 1 being opened.

D is the precipitating tank or vessel, which To wash the precipitated lead in the setwill be more minutely described hereinafter. tling tanks, water is run into the tanks from E,'E, are settling tanks orvessels of which the main, or pumped in, and this water is af- 9 5 5 there may be any number required. terward pumped into the digester. Or, it F is the gas holder, which receives the carmay be pumped from the settling tanks into bon dioxide gas eliminated from the native the sewer by way of the pipes in, Z and n, the lead carbonate, and F is the condenser cocks 10 and 12 being open. The carbon dithrough which the gas passes on its way to oxide gas eliminated from the charge, either io'o so the 1 11 in the digester or the de-carbonator, flows by 1 h gas compressor. way of the pipe 0, to the condenser E (where a condenser or cooler is employed), and thence by pipe p to the gas-holder F. The compressorG takes the gas from the holder by pipe q, and from the compressor it passes to the precipitating tank by way of the pipe 1.

The construction of the precipitating apparatus will now be described with especial; reference to Figs. 2 and 3. The vessel ortank D is by preference cylindrical with convex heads, and stands upright on a base or bed D The pipe 9 is connected with the tank-bot tom at 9*. In the lower part of the tank is mounted, on a horizontal shaft, .9, a ring-like,

rotating agitator, t, which is driven from a.

pulley, s on the shaft and outside of the tank. The shaft rotates in a packed bearing in the shell or wall of the tank. A pipe, u, from the delivery'side of the pump 0, enters the tank at a 'point'above the level offthe agitator t, and at its inner, upturned end,'it isprovided with a perforatedo'r rose nozzle, 11?; This nozzle is supportedby a transverse bar 0. The pipe r from the gas compressor G, enters the tank D at or near its topand on either side as may be found most convenient.

The mode of precipitating is as follows: Water is introduced into the'tank D with the pump 0, by way of the pipes a f and g (Fig. 1), the cocks 13, 4, 5'and 6 being open. The gas is then forced into the tank D from the compressor until the gage, to, shows theproper pressure, preferably about fifty pounds. The water in the tank is now circulated by the pump 0, being taken out'by way of the pipe g and forced in through the pipe, to, the cooks by opening a cook 16, in a by-pipe r, which allows the gas to flow back to the generator F. The basic solution from the digester-is then forced into the tank D by the pump 0, and the agitator t set in motion. This will intimately mix the carbonated water with the basic solution, under pressure, and cause the precipitation of lead in the form of lead by drocarbonate. After the precipitation has been efiected in the tank D, the charge'will" be pumped from said tank into thesettling tanks E,"as before described, or 'be removed from the precipitating tank for the purpose of separating white lead from the solution of neutral acetate, whatever means may be employed for effecting this separation.

Having thus described our invention,'we claim-- 1. The herein described method of effecting the precipitation of white lead from a solution of the basic acetate, which consists in first forming a strong solution of carbon dioxide and water, under pressure, in a closed receptacle by circulation and spraying of the waterin the presence of the gas, then forcing into said solution a solution of basic lead acetate and thoroughly agitating the mixed s0- lutions, and then,'wl1'ile'1the white'lead is still in suspension 'in the'liquid, removing the latter from the tankwherein the precipitation was effected, substantially as set/forth.

2. The combination to form aprecipitating apparatusin the manufacture of'white lead,- :of closed tank D, a rotating agitator mounted therein, a pump, a pipe g connecting the receiving side of the pump with the lower part of the tank D, a pipe u, connecting the discharge of said pump with the tank D, a perforatedn'ozzle', 'u), on the end of the pipe u, withinthe tank and'above the agitator,a gas compressor, a pipe 7', connecting said compressor with the upper part of the tank D, a receptacle for lead acetate solution connected with the receiving side of said pump, and controlling cocks whereby the said'solu-tion may be forced into the tank D,'substantially as set forth.

3. The combination to form a precipitating and separating apparatus in the manufacture of white lead, of a closed precipitating tank,

an agitator therein, a gas-compressor connected with the upper part of the precipitating tank, a settling tank, a pump, and pipes with controlling cocks connecting the precipitat' ing and settling tanks, substantially as set forth. I

In witness whereof we have hereunto signed our names in the presence oftwo subscribing witnesses.

ELWYN WALLER.

BERTRAND O. HINMAN.

Witnesses:

PETER A. Boss, JA ES K. DUFFY. 

